browser-plugin: Refactor the code for binding methods on the plugin.

content/renderer/browser_plugin/browser_plugin_bindings.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BINDINGS_H__
 #define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BINDINGS_H__
 
+#include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ppapi/shared_impl/resource.h"
 #include "third_party/npapi/bindings/npruntime.h"
 
 namespace WebKit {
 class WebSerializedScriptValue;
 }
 
 namespace content {
 
+namespace internal {
+class BrowserPluginMethodBinding;
+}
+
 class BrowserPlugin;
 
 class BrowserPluginBindings {
  public:
   // BrowserPluginNPObject is a simple struct that adds a pointer back to a
   // BrowserPluginBindings instance.  This way, we can use an NPObject to allow
   // JavaScript interactions without forcing BrowserPluginBindings to inherit
   // from NPObject.
   struct BrowserPluginNPObject : public NPObject {
     BrowserPluginNPObject();
     ~BrowserPluginNPObject();
 
     base::WeakPtr<BrowserPluginBindings> message_channel;
   };
 
   explicit BrowserPluginBindings(BrowserPlugin* instance);
   ~BrowserPluginBindings();
 
   NPObject* np_object() const { return np_object_; }
 
   BrowserPlugin* instance() const { return instance_; }
+
+  bool HasMethod(NPIdentifier name) const;
+
+  bool InvokeMethod(NPIdentifier name,
+                    const NPVariant* args,
+                    uint32 arg_count,
+                    NPVariant* result);
  private:
   BrowserPlugin* instance_;
   // The NPObject we use to expose postMessage to JavaScript.
   BrowserPluginNPObject* np_object_;
 
+  typedef ScopedVector<internal::BrowserPluginMethodBinding> BindingList;
+  BindingList method_bindings_;
+
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<BrowserPluginBindings> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginBindings);
 };
 
 }  // namespace content
 
 #endif  //  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_BINDINGS_H__